This add-on rewrites HTML 5 Audio tags to HTML 4 Embed tags, allowing one to use audio plugins (such as those from VLC and other mediaplayers) to play back the audio instead of relying on the browser's built-in capabilities.

Play online videos with subtitles. When you go to any video streaming sites. This will allow you to play with subtitles. Watch movies TV series available on other sites with your customized subtitles. More on http://www.ideawide.com/video-grabber/